Get 2D histograms to have what they are at the top like 1D do

[hschellman]

2D histograms don't say what the plot is. 1D do, I think it was done in plotting_pdf as

TText *t = new TText(.3,.95,label.c_str());
t->SetNDC(1);
t->SetTextSize(.03);

mnvPlotter.DrawDataMCWithErrorBand(datahist, hist, mcScale, "TL", useHistTitles, NULL, NULL,cov_area, statPlusSys);

std::string plotname = Form("Title: %s_CV_w_err_%s",datahist->GetName() ,label.c_str());
t->Draw();